Upload
navin-joshi
View
649
Download
3
Tags:
Embed Size (px)
Citation preview
Physical Properties
Mineral appearance HardnessLusterSpecific gravityStreakCleavage and fracture
Mineral appearance
• How it looks like • What color is it?• Which one of the following is gold? Identify
by appearance.
Hardness
• A measure of how easily a mineral can be scratched
Properties of Minerals
Mohs Hardness ScaleMineralTalc
Gypsum
Calcite
Fluorite
Apatite
Feldspar
Quartz
Topaz
Corundum
Diamond
Rating
1 Softest known mineral. It flakes easily when scratched by a fingernail.
2 A fingernail can easily scratch it.
3 A fingernail cannot scratch it, but a copper penny can.
4 A steel knife can easily scratch it.
5 A steel knife can scratch it.
6 Cannot be scratched by a steel knife, but it can scratch window glass.
7 Can scratch steel and hard glass easily.
8 Can scratch quartz.
9 Can scratch topaz.
10 Hardest known mineral. Diamond can scratch all other substances.
Testing Method
Luster
• The way a mineral reflects a light luster.
• Either metallic or nonmetallic
Specific Gravity
• The specific gravity of a mineral is the ration of its weight compared with the weight of an equal volume of water.
• Gold has specific gravity of 19• It means gold is 19 times heavier than water.
19 times heavier
Specific gravity
Streak
• When a mineral is rubbed across a piece of porcelain tile a streak of powdered mineral is left behind.
Cleavage
• Cleavage is the way that mineral breaks.• Minerals that break along smooth, flat surfaces have
cleavage.• Mica has cleavage
and Fracture!...
• Mineral that breaks uneven, rough, or jagged surfaces have fracture.
• Quartz has fracture
quartzquartz
Identify the minerals below for cleavage and fracture
CLEAVAGECLEAVAGE FRACTUREFRACTURE
in
An illustration appearance:luster,color and streak